Lubrication system for two-cycle engine

An internal combustion engine comprising a lubrication system arranged to lubricate at least a portion of the engine with lubricant, the lubrication system having a lubrication pump configured to periodically pressurize the lubricant toward the portion of the engine, a sensor configured to sense either an engine speed or an engine load of the engine, and a control device configured to control the lubrication pump, the control device configured to determine a first frequency of a periodic pressurization based upon a signal from the sensor, the control device configured to adjust the frequency such that the adjusted frequency is higher than the first frequency, when a signal from the sensor indicates that the engine speed is within a range of engine speeds less than a preset engine speed or the engine load is within a range of engine loads less than a preset engine load.

An internal combustion engine comprising a lubrication system arranged to lubricate at least a portion of the engine with lubricant, the lubrication system having a lubrication pump that periodically pressurizes lubricant toward the portion of the engine, a first sensor configured to sense an operational condition of the engine, a second sensor configured to sense a temperature of the lubricant, and a control device configured to control the lubrication pump, the control device configured to determine a first frequency based upon a signal from the first sensor, the control device determining a second frequency of the periodic pressurization that is higher than the first frequency when a signal from the second sensor indicates that the temperature of the lubricant is less than a preset temperature, wherein the control device is configured to set a pressurizing time of the lubrication pump to a period of time shorter than the maximum period of time that can be set for the lubrication pump at the frequency determined in referring to the control reference, when the signal from the second sensor indicates that the temperature of the lubricant is less than the preset temperature.

An internal combustion engine comprising a lubrication system arranged to lubricate at least a portion of the engine with lubricant, the lubrication system having a lubrication pump that periodically pressurizes the lubricant toward the portion of the engine, a first sensor configured to sense either an engine speed or an engine load of the engine, a second sensor configured to sense a temperature of the lubricant, and a control device configured to control the lubrication pump, the control device configured to determine a first frequency of periodic pressurization based upon a signal from the first sensor, the control device also being configured to adjust the first frequency such that the adjusted first frequency is higher than the first frequency and to adjust a periodic pressurization time of the lubricant pump to a period of time shorter than that required for the pump to complete a full stroke when the control device receives a signal from at least one of the first sensor indicating that the engine speed is less than a preset engine speed or the engine load is less than a preset engine load, and the second sensor indicating that the temperature of the lubricant is less than a preset temperature.

An internal combustion engine comprising a lubrication system arranged to lubricate at least a portion of the engine with lubricant, the lubrication system having a lubrication pump that periodically pressurizes the lubricant toward the portion of the engine, a first sensor configured to sense an operational condition of the engine, a second sensor configured to sense an amount of lubricant delivered by the lubrication pump, and a control device configured to control the lubrication pump, the control device being configured to determine a frequency of periodic pressurization based upon a signal from the first sensor, wherein higher frequencies correspond to greater amounts of lubricant, the control device also being configured to determine a target amount of lubricant to be delivered by the lubricant pump based upon a signal from the first sensor, the control device further being configured to adjust the frequency with a first adjustment value when the sensed amount differs from the target amount, the control device being configured to adjust the frequency with a second adjustment value when the sensed amount differs from the target amount after the frequency has been adjusted by the first value, the first adjustment amount being greater than the second adjustment amount.

A method for controlling a lubrication system that lubricates at least a portion of an engine, the lubrication system having a lubrication pump that periodically pressurizes the lubricant toward the portion of the engine, the method comprising sensing at least one of an engine speed and an engine load of the engine, determining a frequency of the periodic pressurization based upon the engine speed or the engine load, determining whether the engine speed is within a range of engine speeds less than a preset engine speed or the engine load is within a range of engine loads less than a preset engine load, and setting a pressurizing time of the lubrication pump to a period of time shorter than the maximum period of time that is capable to be set for the lubrication pump, when the determination of the engine speed or the engine load is affirmative.

A method for controlling a lubrication system that lubricates at least a portion of an engine, the lubrication system having a lubrication pump that periodically pressurizes the lubricant toward the portion of the engine, the method comprising sensing at least one of an engine speed and an engine load of the engine, determining a frequency of the periodic pressurization based upon at least one of the engine speed and the engine load, determining whether the engine speed is within a range of engine speeds less than a preset engine speed or the engine load is within a range of engine loads less than a preset engine load, and increasing the frequency when the determination of the engine speed or the engine load is affirmative.

A method for controlling a lubrication system that lubricates at least a portion of an engine, the lubrication system having a lubrication pump that periodically pressurizes the lubricant toward the portion of the engine, the method comprising sensing an operational condition of the engine, sensing a temperature of the lubricant, determining a frequency of periodic pressurization based upon the operational condition of the engine, determining whether the temperature of the lubricant is less than a preset temperature, increasing the frequency when the determination of the temperature is affirmative, and decreasing a duration of the periodic pressurization of the lubricant pump to a time period less than a minimum time reciuired for the pump to complete one stroke.

A method for controlling a lubrication system that lubricates at least a portion of an engine, the lubrication system having a lubrication pump that periodically pressurizes the lubricant toward the portion of the engine, the method comprising sensing at least one of an engine speed and an engine load of the engine, sensing a temperature of the lubricant, determining a frequency of periodic pressurization based upon the engine speed or the engine load, determining whether the engine speed is less than a preset engine speed or the engine load is less than the preset engine load, determining whether the temperature of the lubricant is less than a preset temperature, increasing the frequency when the determination of at least one of the engine speed, the engine load, and the temperature is affirmative, and decreasing a duration of the periodic pressurization of the lubricant pump to a time period less than a minimum time required for the pump to complete one stroke.

A method for controlling a lubrication system that lubricates at least a portion of an engine, the lubrication system having a lubrication pump that periodically pressurizes the lubricant toward the portion of the engine, the method comprising sensing an operational condition of the engine, sensing an amount of the lubricant discharged from the lubrication pump, determining a frequency of periodic pressurization based upon the operational condition of the engine, wherein higher frequencies correspond to greater amounts of lubricant, determining a target amount of the lubricant based upon the operational condition of the engine, determining whether the sensed amount differs from the target amount, adjusting the frequency with a first adjustment value when the determination of the difference is affirmative, determining whether the actual amount differs from the target amount after the frequency has been adjusted with the first adjustment value, and adjusting the frequency with a second adjustment value when the second determination of the difference is affirmative, the first adjustment amount being greater than the second adjustment amount.